中国组织工程研究

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三维有限元分析成人安氏Ⅱ1类患者单颌拔牙矫治后颞下颌关节的应力分布

吕儒雅,尹艳娇,刘海霞,陈秋秋,王  婧   

  1. 新疆医科大学第二附属医院口腔科,新疆维吾尔自治区乌鲁木齐市   830063
  • 收稿日期:2017-07-12 出版日期:2017-12-28 发布日期:2018-01-04
  • 通讯作者: 刘海霞,博士,主任医师,新疆医科大学第二附属医院口腔科,新疆维吾尔自治区乌鲁木齐市 830063
  • 作者简介:吕儒雅,女,1988年生,在读硕士,主要从事牙颌畸形诊断与治疗技术的研究。
  • 基金资助:

    新疆维吾尔自治区自然科学基金(医学联合基金)(2014211C084),项目名称:颞下颌关节紊乱病患者口腔健康相关生活质量评价及心理干预的作用

Three-dimensional finite element analysis of the stress distribution on the temporomandibular joint after single maxillary extraction orthodontics in adult patients with Class II division 1 malocclusion

Lv Ru-ya, Yin Yan-jiao, Liu Hai-xia, Chen Qiu-qiu, Wang Jing   

  1. Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China
  • Received:2017-07-12 Online:2017-12-28 Published:2018-01-04
  • Contact: Liu Hai-xia, M.D., Chief physician, Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China
  • About author:Lv Ru-ya, Studying for master’s degree, Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi 830063, Xinjiang Uygur Autonomous Region, China
  • Supported by:

    the Natural Science Foundation of Xinjiang Uygur Autonomous Region, No. 2014211C084

摘要:

文章快速阅读:

文题释义:
颞下颌关节:是人体内可左右联动的负重关节,其结构形态与颅面结构及咬合状态存在较大的相关性,正常生理状态下颞下颌关节的关节窝及髁突位置协调而平衡,然而其相对位置并不是稳定不变的,能够根据其所承受的力学环境不同而做出相对应的改建,当异常咬合产生的应力超出其适应性改建的范围时,则存在颞下颌关节紊乱病的危险。
三维有限元分析:通过单元格划分将连续的模型划分为有限个单元,后期根据研究的需要赋予其不同的材料性能,模拟生物力学环境,计算其所受应力。自1980年运用于口腔医学研究以来,有限元法已涉及正畸的各个领域,如对下颌牙列阻抗中心的有限元分析及不同扩弓矫治器在腭中缝及其他骨缝处产生的应力分布等,且经过国内外学者的大量研究,建模过程简便快捷的同时其模型的精确度也已得到很大提升。
摘要
背景:
临床上对成人安氏Ⅱ1类患者单颌拔牙矫治效果的评价多关注咬合关系及软组织侧貌的改善,然而颞下颌的应力分布却少有学者关注。
目的:分析成人安氏Ⅱ1类患者单颌拔牙矫治后颞下颌关节在牙尖交错位紧咬牙时颞下颌关节各部位的应力分布。
方法:运用相关软件将志愿者的CT及MRI数据融合,构建个别正常牙合及安氏Ⅱ1类错牙合单颌拔牙矫治前、后的颞下颌关节有限元模型,分别对其进行边界约束和力学加载,分析描述3种模型中颞下颌关节各个部位的应力分布。
结果与结论:①与安氏Ⅱ1类错牙合相比,单合拔牙矫治后颞下颌关节无明显应力集中区,应力值大小发生变化,表现为髁突的等效应力较矫治前减小,关节盘及颞骨关节窝的等效应力值比矫治前增大,但应力分布更加均匀,接近正常牙合的应力特征;②结果提示,安氏Ⅱ1类错牙合单颌拔牙矫治降低了安氏Ⅱ1类错牙合罹患颞下颌关节紊乱病的隐患,符合正畸治疗平衡、稳定的矫治目标。

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程
ORCID: 0000-0003-2732-055X(吕儒雅)

关键词: 组织构建, 骨组织工程, 成人, 安氏Ⅱ1类, 单颌拔牙, 颞下颌关节, 三维有限元分析, 新疆维吾尔自治区自然科学基金

Abstract:

BACKGROUND: Clinical evaluation gives much attention to occlusion and improvement of soft tissue profile, while little is reported concerning the stress distribution on the temporomandibular joint in the treatment of Class II division 1 malocclusion adult patients undergoing single maxillary extraction orthodontics.
OBJECTIVE: To analyze the stress distribution on the temporomandibular joint in the treatment of Class II division 1 malocclusion with single maxillary extraction orthodontics.
METHODS: The three-dimensional finite element models of normal and Class II division 1 malocclusion before and after single maxillary extraction orthodontics according to CT and MRI data. The stress distribution on the temporomandibular joint was analyzed after mechanical loading and boundary constraint.
RESULTS AND CONCLUSION: Compared with Class II division 1 malocclusion, the stress distribution on the temporomandibular joint after single maxillary extraction orthodontics had no significant stress concentration area, and the equivalent stress of the condyle was lower than that before treatment, and the equivalent stress of the articular disc and the glenoid fossa of temporal bone were larger than those before treatment. However, the stress was well-distributed, basically fulfilling the stress characteristics of normal occlusion. To conclude, single maxillary extraction orthodontics reduces the risk of temporomandibular joint disorder in the patients with Class II division 1 malocclusion, which is balanced and stable in line with the goal of orthodontic treatment.

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程

Key words: Temporomandibular Joint, Finite Element Analysis, Tissue Engineering

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